Not sure why your email keeps sending me and people in your address book this link?
Last month I used html view for some emails, which I believe resulted in my address book being "harvested" by spammers. I immediately deleted my email address books. Apologies if you have received a spam email. It is definately not from me and my system has not been hacked. The emails are sent from elsewhere with a fake "spoofed" "from" address so they appear to be from me. The spam emails are sent from computers in Croatia and France. Most spam filters and mail servers will reject them as undeliverable but the odd email may get through.
Unfortunately it is impossible to prevent spammers from forging "ian-partridge.com" or anyone's email on the "from" field of an email.